Thread guide brake



Aug. 23, 1938. w. HEINITZ 2,127,771

THREAD GUIDE BRAKE Filed Jan. 23, 1935 5 3 4 i if 9 5 Patented Aug. 23,1938 UNITED STATES PATENT OFFICE I V 2.127.171 mam coma name ApplicationIll zclaims.

The present invention relates to flat knitting machines and moreparticularly to the thread guide brakes of such machines. I

It is already well known to provide two thread 5 guide brakes for thethread guide rod to prevent rebound of thisrod even at higher speeds.

The arrangement of two thread u de brakes, however, allows a relativelysmall increase of the speed only. According to the present invention,however,

the speed during narrowing may nearly be increased to the normal speedthe machine has during the manufacture of plain rows of loops.

With this object in view, the present invention consists in providingtwo thread guide brakes for each direction of the sinking movement, saidthread guide brakes operating one after the other in such a manner, thatthe thread guide rod is held against the stop first by the action of theone brake and thenby the additional braking action of the second threadguide brake.

In the accompanying drawing, forming part of the specification, 'theinvention is shown by way of example. i a

In the drawing:

Fig. 1 is a'front elevation of one construction of brakearrangementaccording to the invention,

Fig. 2 shows a view, similar to Fig. 1, of a modified construction ofthe invention and Fig. 3 is a broken away front elevation of a furthermodified brake arrangement in accord-' ance'with the invention.

Referring now to the example shown in Figur 35 1, the connecting rod lis reciprocated in the usual manner by means not shown in the drawingand carries bearings 2 in which a brake rod 3 is mounted. n the brakerod 3 are mounted the thread guide brakes 4 and 5. In bearings 6, alsocarried by the connecting rod l, a brake rod 1 is journalled on whichthe thread guide brakes 8 and 9 are mounted. Stops 4' and 5' provided atthe thread guide brakes 4 and 5 respectively are adapted to act upon anintermediate memher in engaging a fork I l forming part of a sleeve Wonthe thread guide rod l2. Stops 8' and 9' provided at the thread guidebrakes 8 and 9 respectively are adapted to act upon. an intermediatemember i3 the free end of which engages a fork i4 forming part of asleeve It on the thread guide rod l2. The arrangement is such, that thefree end of the member i0 exactly fits the fork ll of the sleeve ll,while the free end of the member i3 engages the fork I. of the sleeve il with some play. The movements of January 23, 1935, Serial No. 3,164Germany February 6, 1934 the thread guide bar l2 are limited by fixedstops l5 and i6.

During movement of the connecting rod l in the direction of the arrow Ain Fig. 1, the thread guide rod I2 is shifted by the intermediate memberl0 actuated by the thread guide brake 5. The intermediate member i3during this vshifting movement bears against the right hand prong I ofthefork it of sleeve l4. If the thread guide rod it comes intocontactwith the-fixed stop 10 IS, the intermediate member ill-is, during thecontinued movement of the connecting rod l, shifted further by thethread guide-brake 9 until it bears against the left hand prong of thefork It of the sleeve M. 15

The thread guide rod l2, therefore, is held against the fixed stop i5first by the thread guide brake ti and later on also by the thread guidebrake 9.

During movement of the connecting rod in 20 the direction of the arrow Bin Figure l, the

thread guide rod i2 is shifted by the brake 5 acting upon. theintermediate member in. The intermediate member i3 during this movementbears against the left hand prong of the fork Hi of the sleeve It. Ifthe thread guide rod it comes into contact with the fixed stop It, theintermediate member [3 is, during the continued movement of theconnecting rod i, shifted further by the thread guide brake 8 until itbears against the right hand prong of the fork M of the sleeve MUHereby, as described with reference to the movement of the thread guiderod It in the direction of the arrow A, the rod It also is held againstthe flxedstop i6 first by the thread guide brake l and later on by thethread guide brake 8 also.

According to the modification shown in Fig. 2. the thread guide brakes 4and 5 are provided with stops or lugs ll and I8 respectively, while thethread guide brakes B and 9 are provided with stops or lugs l9 and 20respectively. The distance between the lugs l1 and I8 is a littlesmaller than the distance between the lugs i9 and Ill. 4.5

Mounted on the thread guide rod i2 are sleeves 2i, 22 each having a.nose 2|, 22 respectively.

The stop or lug I8 is adapted to act upon the nose 2| during themovement .of the thread guide rod l2 in the direction of the arrow A. Byto reason of the particular arrangement described above, aclearancestill exists between the stop or lug 20 and the nose 22' of thesleeve 22. As soon as the thread guide rod i2 comes into contact withthe fixed stop It, the stop or lug 20, on

further movement of the connecting rod I, engages the nose 22', so thatthe thread guide rod i2 is held against the fixed stop I5 by the twostops or lugs I8 and 20. On movement of the thread guide rod I! in theopposite direction, i. e. in the direction of the arrow B, towards thefixed stop 16, the action of the brake arrangement is the same. Firstthe lug ll acts on the nose 2|. of the sleeve 2| at which time aclearance still exists between the lug l9 and the nose 22- of the sleeve22. When, however, the thread guide rod l2 comes into contact with thefixed stop I6, the lug I9 engages, during Iurther movement of theconnecting rod l, the nose 22' of the sleeve 22, so that now the threadguide rod I2 is held against the fixed stop It by means of both lugs I1and IS.

In Fig. 3 a modification is shown according to which the two threadguide brakes l and 5 are arranged directly one behind the other in thelongitudinal direction of each brake rod and carry a lug I engaging afork ll provided on the thread guide rod II. The jaws 25 and 26 of thebrakes are, in a. well known manner, actuated by springs 21 and 28respectively. The jaws 26 of the brake are a little shorter than thewidth of the bearing, while the corresponding spring 20 fits the bearingwithout play. The brake jaws 26, therefore, may slide upon the brake rod3 and in each direction of movement of the thread guide rod l2 they comeinto action as soon as the thread guide rod engages the fixed stop. Thatis to say, during movement of the thread guide rod l2 in the directionof the arrow B, first the thread guide brake I and then the thread guidebrake 5 comes into action, whereupon on movement in the direction of thearrow A also first the thread guide brake I and then the thread guidebrake 5 comes into action, as the brake jaws of the latter had beenshifted in their bearing.

The thread guide brake according to the invention may be used inconnection with any kind of thread guide rods, i. e., for thread guiderods adapted for the manufacture or plain work as well as for threadguide rods adapted for making plated work.

Of course, the same eiIect is obtained, if the brakes are arranged sideby side in a brake casing instead, as shown in Fig. 3, directly onebehind the other.

What I claim is:

1. In a thread guide brake mechanism for flat knitting machines, athread guide rod, a brake rod, a brake housing carried by said brakerod, a brake lug carried by said brake rod and subdividing said housingin two halves, a sleeve on said thread guide rod, a fork formed at saidsleeve and adapted to receive the free end of said brake lug, a pair ofbrake vjaws exactly fitting one half of said brake housing, a springcooperating with said brake jaws exactly fitting said one half of saidbrake housing, a second pair of jaws arranged with play in the otherhalf of said brake housing, and a second spring cooperating with saidsecond pair of brake jaws and exactly fitting said other half of saidbrake housing.

2. In a thread guide brake mechanism for fiat knitting machines, athread guide rod, fixed stops limiting the reciprocating movements ofsaid thread guide rod, a brake housing, and two brake members arrangedin said brake housing and acting successively on said brake guide rodtoward the end of its movement in either direction as limited by saidfixed stops.

WOLDEMAR HEINI'IZ.

